Representative transmission electron micrographs showing the enhanced storage of intramyofibrillar glycogen in type I fibers at 24 h post exercise (B) compared with pre exercise (A), and the lower content of intermyofibrillar and intramyofibrillar glycogen at 48 h post exercise (C) compared with the control leg (D).

<p>Glycogen particles are seen as black dots. Long arrows indicate intramyofibrillar glycogen and short arrows indicate intermyofibrillar glycogen. Mi, mitochondria. Z, Z-disk. M, M-band. In the upper left corner, selected glycogen particles are shown at a higher magnification (selected region indicated by asterisk). Scale bar: 0.5 μm and 30 nm in large images and inset boxes, respectively.